Logical Operators

Logical operators are used to combine boolean assertions. Analytica uses the values True=1 and False=0.

When applied to values other than 0 or 1, other parameter values are interpreted as follows:

• a non-zero numeric is treated as true
• NaN is treated as ambiguous (could be 0 or 1)
• Null results in a warning, with a Null result.
• Any other data type results in an error.

Note: The value special Undefined is considered deprecated in Analytica 4.0. Null is now used exclusively for a non-existent value from within Analytica expressions.

INF, NAN, Null, and Undefined

And

A And B

True if both A and B are true. False if either A or B is false.

In this table, x signifies a numeric value that is not equal to zero (and is not NaN).

And	0	x	NaN	Null
0	0	0	0	0
x	0	1	NaN	Null
NaN	0	NaN	NaN	Null
Null	Null	Null	Null	Null

Or

A or B

True if A or B or both are true.

In this table, x signifies a numeric value that is not equal to zero (and is not NaN).

And	0	x	NaN	Null
0	0	1	NaN	Null
x	1	1	1	Null
NaN	NaN	1	NaN	Null
Null	Null	Null	Null	Null

Not

Not	0	x	NaN	Null
	1	0	NaN	Null